Alpinestars Helmets Size Chart

Road & MX Helmets
Size	Head Circumference (cm)	Head Circumference (in)
XS	53 - 54	20.8 - 21.2
S	55 - 56	21.6 - 22
M	57 - 58	22.4 - 22.8
L	59 - 60	23.2 - 23.6
XL	61 - 62	24 - 24.4
2XL	63 - 64	24.8 - 25.2

Vector Series (MTB/ATB)
Size	Head Circumference (cm)	Head Circumference (in)
S	51 - 55	20 - 21.6
M	55 - 59	21.6 - 23.2
L	59 - 63	23.2 - 24.8

Sizing information is provided by the manufacturer and does not guarantee a perfect fit. Please use this chart as a guide only.